# PSEB 7th Class Maths Solutions Chapter 3 Data Handling Ex 3.4

Punjab State Board PSEB 7th Class Maths Book Solutions Chapter 3 Data Handling Ex 3.4 Textbook Exercise Questions and Answers.

## PSEB Solutions for Class 7 Maths Chapter 3 Data Handling Ex 3.4

1. State whether the following is certain to happen, impossible to happen, may happen.

Question (i).
Two hundred people sit in a Maruti car.
Impossible to happen.

Question (ii).
You are older than yesterday.
Certain to happen.

Question (iii).
A tossed coin will land heads up.
Can happen but not certain.

Question (iv).
A die when rolled shall land up 8 on top.
Impossible to happen.

Question (v).
Tommorrow will be a cloudy day.
Can happen but not certain.

Question (vi).
India will win the next test series.
Can happen but not certain.

Question (vii).
The next traffic light seen will be green.
Can happen but not certain.

2. There are 6 marbles in a box with numbers 1 to 6 marked on them.
(i) What is the probability of drawing a marble with number 5 ?
(ii) What is the probability of drawing a marble with number 2 ?
Solution:
Sample space : {1, 2, 3, 4, 5, 6}
There are 6 equally likely possible outcomes.
Outcomes : 1, 2, 3, 4, 5 or 6.
(i) Probability of drawing a marble with number 5 = $$\frac {1}{6}$$
(ii) Probability of drawing a marble with number 2 = $$\frac {1}{6}$$

3. There are two teams A and B. A coin is flipped to decide which team starts the game. What is the probability that team A will start ?
Solution:
When a coin is tossed once. The number of possible outcomes is head or tail
Sample space : [H, T]
The probability of getting head or tail is equal and is $$\frac {1}{2}$$ for each.
∴ The probability that team A will start = $$\frac {1}{2}$$

4. A bag contains 3 red and 7 green balls. One ball is drawn at random from the bag. Find the probability of getting (i) a red ball (ii) a green ball.
Solution:
Total number of balls in the bag = 3 + 7 = 10
(i) The event is getting a red ball.
Probability (getting a red ball) = $$\frac {3}{10}$$

(ii) The event is getting a green ball.
Probability (getting a green ball) = $$\frac {7}{10}$$

5. Multiple Choice Questions :

Question (i).
The probability of an impossible event is : ………………
(a) -1
(b) 0
(c) $$\frac {1}{2}$$
(d) 1.
(b) 0

Question (ii).
The probability of selecting letter G from the world ‘GIRL’ is :
(a) 1
(b) $$\frac {1}{2}$$
(c) $$\frac {1}{4}$$
(d) $$\frac {1}{3}$$
(c) $$\frac {1}{4}$$

Question (iii).
When a die is thrown, the probability of getting a number 4 is :
(a) $$\frac {1}{2}$$
(b) $$\frac {1}{3}$$
(c) $$\frac {4}{6}$$
(d) $$\frac {1}{6}$$
(d) $$\frac {1}{6}$$
(a) $$\frac {5}{10}$$
(b) $$\frac {5}{15}$$
(c) $$\frac {10}{15}$$
(b) $$\frac {5}{15}$$